Lawn mower

Abstract

The lawn mower includes a cutter blade and a rotary shaft for rotating the cutter blade, and cuts grass by rotating the cutter blade while traveling. In a state where the lawn mower is placed on a horizontal plane, the rotary shaft is held such that an upper side of a rotation axis line of the rotary shaft is inclined toward a rear side in a traveling direction of the lawn mower, with respect to a vertical direction.

1 . A lawn mower comprising:
 a cutter blade;   a rotary shaft configured to rotate the cutter blade;   the lawn mower being configured to cut grass by rotating the cutter blade while traveling,   wherein, in a state where the lawn mower is placed on a horizontal plane, the rotary shaft is held in a manner so that an upper side of a rotation axis line of the rotary shaft is inclined toward a rear side in a traveling direction of the lawn mower, with respect to a vertical direction.   
     
     
         2 . The lawn mower according to  claim 1 , wherein
 the cutter blade includes a lower blade member and an upper blade member which are disposed so as to overlap each other in the vertical direction.   
     
     
         3 . The lawn mower according to  claim 1 , wherein:
 the cutter blade includes:   an attachment portion attached to the rotary shaft; and   a first arm portion and a second arm portion each extending from the attachment portion in a radially outward direction of the rotary shaft;   the first arm portion includes a first blade portion configured to cut the grass;   the second arm portion includes a second blade portion configured to cut the grass;   in a state in which the rotation axis line of the rotary shaft extends along the vertical direction and the cutter blade is horizontally disposed, a position of a first portion of the first blade portion in the vertical direction and a position of a second portion of the second blade portion in the vertical direction are different from each other; and   a distance from the rotation axis line to the first portion in a horizontal direction and a distance from the rotation axis line to the second portion in the horizontal direction are equal to each other.   
     
     
         4 . The lawn mower according to  claim 1 , further comprising:
 a housing configured to house the cutter blade therein,   wherein:   the housing includes:   a front wall located more forward than the rotary shaft in the traveling direction; and   a rear wall located more rearward than the rotary shaft in the traveling direction;   and   in the state where the lawn mower is placed on the horizontal plane, a position of a lower end of the front wall in the vertical direction is higher than a position of a lower end of the rear wall in the vertical direction.   
     
     
         5 . The lawn mower according to  claim 3 , wherein
 the first arm portion and the second arm portion extend in directions opposite to each other with the attachment portion being centered.   
     
     
         6 . The lawn mower according to  claim 1 , wherein
 the cutter blade includes:   an attachment portion attached to the rotary shaft; and   a first arm portion and a second arm portion each extending from the attachment portion in a radially outward direction of the rotary shaft, and   wherein only the first arm portion among the first arm portion and the second arm portion is provided with a wing portion that is inclined upward, toward a reverse rotation direction opposite to a blade rotation direction which is a rotation direction of the cutter blade.